Bobbin for spinning machines



P. SHARP Sept. 20, 1927.

BOBBIN FOR SPINNING MACHINES Filed Dec. 2l. 1926 Patented Sept. 20, 19,27.

" PETER SHARP, or :PERTH :scoTLANn A Bonnin ron srinnrireiviacninns.

Thisinyenti'on relates to VforfA mounting and applying',V drag tobobbins for Spinning machinesfin v-which said bobbins aremounted Aupon positively :driven spindles, and the object is to provide extremely simple c andeflicient means for the automatic regulationjof the thread tensionso'. tojinaintain said tension at the proper degree' as the diameltjer Lof the fbobbin increases duringV the winding ofthethread thereon.

'llhefinve ntion comprises y.improved drag embodying a resilient member or-memf ,bers'fcapable of, being adjustably applied to thevbobbin/ and the' tensionof which varies accord-ing "tol the `diameter` of the bobbin, whereby the required drag on the bobbinas thegwi'ndin'g proceeds isV automatically obtained. 5 Y

The l,iniffention'lis hereinafter fully de# scribed and pointedY out-'in the appended claims with reference to. the accompanying' drawings in which Fig. l is a sectional elevation with parts broken away and showing two bobbins, and Fig. 2 is a. sectional plan of Fig. l showing particularly the improved form of drag.

Asl shown in the Ydrawings I provide the n base al of the bobbin a (which rests on the usual rising and falling bobbin bar or build*- 3" er plate '5) with a recess c formed by an enlargement of the bore of the bobbin through which the spindle cl passes; and l. t this recess, which may be approximately about half anA inch in depth, over an upstanding boss e on the builder plate b, this boss embracing the spindle Z as it passes intok the bobbin.

The boss mentioned may be attached to, or formed in one with the builder plateor, as shown, carried by a. separate plate or member /L directly carried by the builder plate by screws h1 so long as it supports the bobbin in the manner stated. The provision of such a boss prevents the bobbin a being i pressed laterally against the spindle al and its speed being consequently accelerated due to the increased pressure as the winding pro- Aceeds and the speed gets greater, since it always keeps the bobbin properly centred. In addition to the usual bottom friction of the bobbin a on the builder platee there is a certain amount of friction between' the boss e and therrecess 0 in the base of the bobbin which acts as a brake to control the rotation of the. bobbin. n

The efficiency of such bobbin mounting anie'ter slightly' largerutlian'that 'offthezspin- A60 die; for 'eixaniple, inch 'i n rease 'as shown at oin the left of Figs; lfai'dQ. I creased vheter]extends'tojfwithin af'sh'ort distance ofthe topyof'fthebobbin, for in-g stance toll/4' Yinchesv itherefrein, the. reni'i der i or thebore at jjbeig practically 4the mei that of tlie'spindle djthatisftofsay, inail;- ingf a Asubstantially close thereon. ""The distance of* the enlarged'boi'je 'frointhe Itbp j of 'the 'bobbin may Ibe yaried accrding lto'i'O requirements. The bobbin thus rcannotV 'en gage Hx'the I spindlefat the enlarged bere biit is steadie'd and centred the't reduced "here att'lie top fand by "the bess e on 'the builder plate or 4other support' which engages the fre? 75 cess "c in thebase and on which'fthe bobbin' revolves.

The improved drag shown more vparticularly in Fig. Q includesa resilient or exible member or members which will causev the'SO braking eiect y to become automatically greater as the speed of the bobbin increasesl during the winding. The tension of Said resilient member thus varies with the speed of the bobbin and accommodates itself to the degree of winding, so that the drag automatically applies the required amount of braking force at all times. i

The improved form of drag differs from Y those hitherto known comprising an ineXten- 9o sible weighted member adapted to engage a y groove a2 in the base of .the bobbin, such as a plain leather or libre band commonly provided with an attached depending weight, in n that it embodies a flexibleand resilient mem- 05 ber comprising, for instance a. spring or elastic element as of rubber followed by a length of leather or other inextensible ma-V terial g and then another spring or elastic element f1.

@ne end of said drag is secured to one side Yof thefbuilder plate for example being secured to a fiange b1 thereof by means of a rivet f2; the inextensible member then passes about the groove a2 in the bobbin base to 105 brake same and the opposite end f1 is engaged on the otherside of the, builder plate, such as by entering one of aseries of notches b3 in a flange b2 of said plate as usually practised. v The end ofthe drag may be however provided with a hook f3 which engages under the edge of the builder plate as shown in Fig. l. The latter connection is detaclr able to vary the amount oi initial tension required to provide 'for differences in the size of bobbin used by shitting the end of the tirar` into diilerent notches nearer to or larther from the axis ot tbe bobbin, but under Ordinar)T running, and particularly with the use of the boss e above described, the resilie ent braking' etl'eet exerted by the drag,r is sulicient to automatically control the speed by reason oi' the elasticity ol said drag which is tensioned to a `greater or less extent as tlie speed of the bobbin increases or decreases during' the filling o1 same.

It will be apparent from the above description that the mounting oit the bebbin o on the boss e which is centrally7 lixed allows the rotation of the bobbin to be easier than with known forms of mounting and prevents tendency of the bobbin to risc during its rotation. Tlie improved `term oi' drag also exertspressure only on one side of the bobbin a and on one side of the boss e, suoli pressure. being taken up by the boss and tending to provide for a uniform steady motion of the bobbin. Again with the drag of the present invention no shitting oi the drag is necessary during the winding of the bobbin, the braking action beingr entirely automatic, and the pressure on the bobbin is very limited, Wear and tear on the bobbin being thus reduced to a minimum. The above constructions render it possible for a much finer and weaker thread or yarn to be spun on the same bobbin as at present, owingr to the centralization produced by the boss e on which the bobbin rotates, and the resiliency of the drag which will permit it to give, due to possible temporary stoppage of the bobbin owing' to slight lumps on the thread, and then to immediatelyT resume its normal condition.

lllhat I claim as my invention and desire to secure by Letters Patent of the United States is l. A dragI ior a spinningr bobbin including an .inextensible member and an elastic member in combination with said inextensible member.

2. A drag for a spinning bobbin including` an inextensible member, and elastic members connected one to each end of said inextensible member.

ln witness whereof` I have signed this specification.

PIETER SHARP. 

